Wall balloon for pottery apinting

Onyx Black porcelain

£19.50Stock Available:  46
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Onyx Black Porcelain takes on a beautiful black/graphite colour when fired as recommended to the upper part of its firing range. It is highly plastic making it ideal for wheel-throwing and modelling alike. Suitable for tableware. Supplied in a 5kg pack.


5 kilos.


Onyx Black Porcelain is suitable for tableware (food-safe), according to ISO 6486.




Firing range: Cone 6-7 (1242º-1260ºC)


Biscuit: Cone 06 (1012ºC)


Water content: 20%


Plasticity (IP Atterberg): 11


Carbonate content (CaCO3): 0%


Drying shrinkage: 5.4%


Firing shrinkage at Cone 6: 10.3%


Porosity (water absorption) at Cone 6: 0.0%


Fired bending strength at Cone 6: 39.8 N/mm2


Thermal coefficient (a25-500ºC): 54.3x10-7ºC-1"